#version 450

//just creat a big triangle to cover the whole screen

void main() 
{	
	vec2 outUV = vec2((gl_VertexIndex << 1) & 2, gl_VertexIndex & 2);
	gl_Position = vec4(outUV * 2.0f - 1.0f, 0.0f, 1.0f);
}